JP3393356B2 - Receiving device and receiving method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving device and a receiving method. In particular, the present invention relates to a receiving device and a receiving method capable of preferentially displaying subtitles when subtitles are broadcast by periodically detecting whether or not subtitles are broadcast.

[0002]

2. Description of the Related Art Some conventional television receivers capable of receiving both character multiplex broadcasting and television broadcasting, for example, include two tuners and one decoder. Such a television receiver can display either one of the television broadcasts of the channels received by the first or second tuner, and also receive the television broadcast of a certain channel by the first tuner. In addition, the second tuner can display the output of the first tuner on the main screen and the output of the second tuner on the sub screen by receiving another channel. There is. In this case, the viewer can watch the programs on the two channels at the same time.

Further, the screen is divided into two, and one screen is
In addition to displaying the output of the first tuner, the decoder extracts and decodes teletext data (data for teletext) that is data transmitted as teletext from the output of the second tuner. The teletext data can be displayed on the other screen.

[0004]

In the above television receiver, for example, when only the program of a certain channel is to be viewed with the first tuner as the main tuner, If received by a tuner, the second tuner has traditionally been used to refresh the memory for displaying teletext data.

That is, since the teletext data is displayed after the received teletext data is temporarily stored in the memory, the screen display is text-multiplexed while the program of a certain channel is being displayed. When switching to broadcasting,
The display cannot be performed until one line (horizontal scanning line) or one screen of teletext data is accumulated in the memory. Therefore, when only the first tuner is in use so that the teletext data can be displayed immediately, the television broadcast (of the channel reserved by the viewer in the second tuner) ( (Text-multiplexed broadcast) is received, decoded by a decoder, and the latest teletext data obtained as a result is written in a memory.

By the way, some viewers desire to display the subtitles when the subtitles broadcast by the character multiplex broadcasting is started on the channel while watching the program of the certain channel. . That is, for example, for a hearing impaired viewer or the like, if the speech or content of the program of the channel is broadcast in subtitles on the channel being viewed, the subtitles are preferentially displayed. Is desirable.

However, in the second tuner,
As described above, when the television broadcast signal of a channel different from that of the first tuner is received for the memory refresh and the decoder is used for decoding the same, the first tuner receives it. It was difficult to detect whether or not subtitles are being broadcast on the channel being broadcast.

Further, as described above, even when the television broadcast and the character multiplex broadcast are simultaneously viewed by dividing the screen into two, if the channels of the television broadcast and the character multiplex broadcast are different, I had a similar problem.

Therefore, another decoder is provided and the output of the first tuner is decoded by the decoder to determine whether subtitles are being broadcast on the channel received by the first tuner. There is a possible method to detect the
There is a problem that the number of decoders increases by one, the size of the device increases, and the cost increases.

The present invention has been made in view of such a situation, and detects whether subtitles are being broadcast on the channel currently being viewed without increasing the size and cost of the device. However, when subtitles are being broadcast, the subtitles can be preferentially displayed.

[0011]

The receiving apparatus of the present invention includes first and second receiving means for receiving a television broadcast signal, demodulating a signal of a predetermined channel and outputting a demodulated signal, and a first receiving means. Alternatively, one decoding means for extracting and decoding teletext data from any one of the demodulated signals output from the second receiving means and one of the signals output from the first or second receiving means are provided. When the selecting means for selecting and supplying to the decoding means and the demodulated signal output from the second receiving means are selected, the demodulating signal output from the first receiving means is supplied to the selecting means. Firstly, the control means for performing the control for periodically selecting and the selecting means are
Detecting means for detecting whether the teletext data extracted by the decoding means is a caption when the demodulated signal output from the receiving means is selected, and the control means uses the teletext by the detecting means. When the data is detected to be subtitles, the selecting unit is forced to select the demodulated signal output from the first receiving unit.

The receiving method of the present invention receives the television broadcast signal on which the teletext data, which is the data for teletext broadcasting, is superposed, demodulates the signal of the predetermined channel and outputs the demodulated signal. The second receiving means, one decoding means for extracting and decoding teletext data from either the demodulated signal output from the first or second receiving means, and the first or second receiving means. A receiving method of a receiving device, comprising: selecting means for selecting one of the output signals and supplying it to a decoding means, wherein the selecting means selects a demodulated signal output from the second receiving means. In this case, the selecting means is caused to periodically select the demodulated signal output from the first receiving means, and the selecting means makes the first means.
If it is detected that the teletext data extracted by the decoding means is a caption when the demodulated signal output from the receiving means is selected, and the teletext data is detected to be a caption, The selection means is forced to select the demodulated signal output from the first receiving means.

[0013]

In the receiving apparatus of the present invention, the first and second
Receiving means receives the television broadcast signal, demodulates a signal of a predetermined channel and outputs a demodulated signal, and the decoding means outputs the demodulated signal from either the first or the second receiving means. , Teletext data is extracted and decoded. The selecting means is adapted to select one of the signals output from the first or second receiving means and supply it to the decoding means. The control means controls the selection means to periodically select the demodulated signal output from the first receiving means when the selecting means selects the demodulated signal output from the second receiving means. The detecting means is configured to detect whether or not the teletext data extracted by the decoding means is a caption when the selecting means selects the demodulated signal output from the first receiving means. There is. Then, the control means is configured to forcibly select the demodulated signal output from the first receiving means by the selecting means when the teletext data is detected to be a caption by the detecting means. .

In the receiving method of the present invention, when the selecting means selects the demodulated signal output from the second receiving means, the selecting means receives the demodulated signal output from the first receiving means. If the teletext data extracted by the decoding means is a subtitle when the demodulation signal output from the first receiving means is selected by the selection means, the teletext data is detected. When it is detected that is a subtitle, the selecting unit is forced to select the demodulated signal output from the first receiving unit.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a television receiver capable of receiving character multiplex broadcasting to which the present invention is applied will be described below. As a preparation for the preceding step, character multiplex broadcasting will be briefly described.

In the character multiplex broadcasting, characters and figures are broadcast in the form of digital signals by being superimposed on the vertical blanking period of video signals of television broadcasting. Currently, according to the character multiplex broadcasting, for example, news, weather forecast, stock price information, program guide by television broadcasting, and other various information (text broadcasting data) are provided.
Furthermore, according to the character multiplex broadcasting, as described above, it is also possible to broadcast subtitles indicating the dialogue and contents of the program and superimpose them on the video for display.

Character multiplex broadcasting capable of transmitting various kinds of information (text broadcasting data) as described above is carried out as follows. That is, the teletext data is, as shown in FIG.
During the vertical blanking period of the video signal of the television broadcast signal, which is an analog signal, it is superimposed and broadcast in the form of a digital signal.

Here, FIG. 1 shows a waveform of a vertical blanking period of a video signal in a television broadcast conforming to the NTSC system. Note that FIG. 1A or FIG.
(B) represents a vertical blanking period of an odd field or an even field.

In the teletext data (described as a text signal in FIG. 1), the 10th H (line) to 21th H in which no equivalent pulse exists in the vertical blanking period (vertical blanking period), and Although it is possible in principle to superimpose on the 273H to 284H, at present, in consideration of the influence of the video signal on the display screen, etc., the 16th and 21H, and the 279H and 284H are currently considered. By superimposing teletext data, teletext broadcasting is performed.

The transmission system includes a pattern system and a code system. In the pattern system, characters and figures are converted into teletext data as a digital signal of 0 or 1 for each pixel and transmitted. . In this case, on the receiving side, teletext data is temporarily stored in the memory,
It is read out and displayed in synchronization with the sync signal of the video signal. On the other hand, in the code system, characters and figures are transmitted by a predetermined code. That is, a character or a graphic element is associated with a predetermined code in advance, the character is converted into a code associated with the character and transmitted, and the graphic is a predetermined graphic element as necessary. And is converted into a code associated with the graphic element and transmitted. In this case, the receiving side has a generator (character generator) that generates a character or a graphic segment corresponding to the code by inputting the code, and the generator generates a character or a character based on the received code. A graphic element is generated, and this is temporarily stored in the memory, and thereafter displayed in the same manner as in the pattern system.

In the pattern method, since characters and figures are transmitted in pixel units, complex characters and figures can be transmitted, and there are few display errors, but since the amount of data increases, it is necessary to transmit per unit time. There is a drawback that there are few characters and figures that can be processed.On the other hand, the code method transmits characters and figures by code, so the amount of data is small and many characters and figures can be transmitted per unit time. There are many display errors and there is the drawback that a generator is required on the receiving side. Therefore, recently, a hybrid method has been studied in which frequently used characters and simple figures are transmitted by a code method, and characters that are rarely used, complicated characters, and figures are transmitted by a pattern method. Here, FIG.
Shows the basic parameters of the pattern method and the hybrid method.

As shown in FIG. 2, in the character multiplex broadcast display mode, there are five display modes: fixed screen display, super fixed display, subtitle display, full screen vertical scroll display, and one line horizontal scroll display.
There are two modes. The display screen by the character multiplex broadcasting is, for example, 248 × 204 pixels in which a block of horizontal × vertical 8 × 12 pixels is used as a sub block. In the whole fixed display mode, characters and figures arranged on the entire display screen are static. It is displayed in the state where it was done. In the super fixed display mode, characters and figures arranged on the entire display screen are superimposed on the image of the television broadcast and displayed in a still state. In the subtitle display mode, for example, information that complements the content of a program by television broadcasting and other information are displayed in subtitles superimposed on the image of television broadcasting. This mode is used, for example, when displaying Western movies together with Japanese subtitles, but as mentioned above, it can also be used when transmitting subtitles indicating the dialogue or contents of a program for the hearing impaired. It is useful.

In the full-length vertical scroll display mode, characters and figures arranged on the entire display screen except the page header portion (top line of the display screen) are displayed while being moved upward at an appropriate speed. In the one-line horizontal scroll display mode, one line on the display screen is superimposed on the image of the television broadcast and further displayed while being moved from right to left, for example.

Next, the teletext data is transmitted as a data packet in units of 1H (1 horizontal scanning line) of the video signal by television broadcasting. FIG. 3 shows the structure of a data packet. Like a normal horizontal scan line,
A horizontal sync signal (H sync) (television horizontal sync signal) is arranged at the beginning, and a color burst is arranged after that. Then, following the color burst, a synchronization part, a prefix, and an information data part (data block) are sequentially arranged, and a data packet is formed by the prefix and the information data part.

The synchronization section is composed of a clock run-in (CRI) for bit synchronization and a framing code (FC) for frame synchronization. The prefix is composed of a service identification code and a data identification code. The service identification code includes a code for identifying whether the data arranged in the information data section is provided by character multiplex broadcasting, facsimile broadcasting, or other broadcasting services. There is. The data identification code includes a code for identifying whether the transmission system is the pattern system or the code system, a code for identifying the display mode described above, and the like. In the information data section, a code associated with a character or a graphic element, a digital signal (image data) of a pixel unit of 0 or 1, information regarding a color attached to a character or a graphic (color code), and other information Substantial data (text broadcast data) such as (for example, a signal for page control of the display screen) is arranged.

Since the format shown in FIG. 3 is used for both the data packet of the pattern system and the code system, it is easy to change from one system to the other system, and a hybrid system combining both systems is used. It is possible to easily extend the system.

FIG. 4 shows the configuration of an embodiment of a television receiver capable of viewing the character multiplex broadcasting as described above. The antenna 1 is adapted to receive a radio wave of television broadcasting conforming to the NTSC system by ground waves in the VHF band and the UHF band, for example, and the received signal is a U / V (UHF / VHF) tuner (hereinafter, As appropriate
2) and 3). The tuner 2 or 3 (first and second receiving means) detects a television broadcast signal of a predetermined channel from a received signal from the antenna 1 according to an instruction of a microcomputer (hereinafter, appropriately referred to as a microcomputer) 11. , Demodulate, and output a video signal of the resulting demodulated signal to a Y / C / J (Y / C separation / jungle) processing circuit (hereinafter, appropriately referred to as a processing circuit) 4 or 5 respectively. Has been done. Further, the video signal output from the tuner 2 or 3 is the terminal a of the switch 6.
Alternatively, it is also supplied to b.

The sound contained in the demodulated signal is supplied to a speaker (not shown) and output.

The processing circuit 4 or 5 is controlled by the microcomputer 11, separates the video signal output from the tuner 2 or 3 into a luminance component (Y) and a chroma component (C), and further divides the luminance component and the chroma component. , RGB (Red Green Bl
ue) is converted into three components. The output of the processing circuit 4 is supplied to the mixer 9, and the output of the processing circuit 4 is supplied to the mixer 9 via the two-screen processing block 8.

The switch 6 (selection means) is the microcomputer 11
Controlled to select either terminal a or b,
As a result, one of the video signals output from the tuner 2 or 3 is supplied to the character multiplex broadcast decoder (hereinafter, appropriately referred to as a decoder) 7.

The decoder 7 (decoding means) is provided with a horizontal scanning line (vertical block as described with reference to FIG. 1) on which teletext data is superimposed from a video signal supplied from the tuner 2 or 3 through the switch 6. 16th of ranking period
H, 21H, 279H, and 284H) are extracted and decoded (constituting a teletext display screen).

Here, FIG. 5 shows a detailed configuration example of the decoder 7. The video signal supplied from the tuner 2 or 3 via the switch 6 is supplied to the clock generation circuit 21 and the data slicer 22. The clock generation circuit 21 is configured to generate a clock synchronized with the video signal based on the video signal input thereto and supply the clock to the data slicer 22. Based on the clock from the clock generation circuit 21, the data slicer 22 recognizes the timing of the horizontal scanning line on which the teletext data (data packet) is superimposed in the video signal input thereto, and performs the horizontal scanning. The teletext data superimposed on the line is extracted. This teletext data is supplied to the buffer 23 and temporarily stored.

The detection circuit 24 (detection means) is the buffer 2
It is configured to detect whether or not the teletext data stored in 3 is a subtitle, and if it is a subtitle, the microcomputer 11 is notified to that effect.
This detection is performed by referring to, for example, the data identification code (display mode arranged in the data packet as the data identification code) described in FIG.

The display screen construction unit 25 is adapted to read out the teletext data stored in the buffer 23 as appropriate and convert it into data (hereinafter, referred to as display data) that constitutes the teletext display screen. . This display data is once stored in the RAM 26,
The display screen configuration unit 25 reads display data from the RAM 26 according to a command from the microcomputer 11, performs processing necessary for displaying, for example, coloring, flushing, concealing, and the like, and then converts the RGB image signal to the mixer 9 and outputs it. It is designed to output to.

Returning to FIG. 4, the two-screen display block 8 is controlled by the microcomputer 11 so that the video signals (RGB signals) supplied from the processing circuit 5 may be used as they are or as a so-called picture-in-picture child screen. And is output to the mixer 9. Mixer 9
The (output means) is controlled by the microcomputer 11, and the processing circuit 4
A video signal (RGB signal) output from the video signal, a video signal output from the processing circuit 5 via the two-screen processing block 8,
Alternatively, one of the video signals output from the decoder 7 is used as it is, or two of them are combined and the monitor 10
It is designed to output to. The monitor 10 is, for example, a CRT or the like, and is configured to display the output of the mixer 9.

The microcomputer 11 (control means) controls switching of the switch 6 as described above, and also controls other blocks constituting the apparatus. The memory 12 is, for example, a non-volatile memory, and is configured to store the last channel (the channel selected in a straight line where the power is turned off) and other data necessary for the operation of the microcomputer 11. When the power of the television receiver is turned on, the microcomputer 11 refers to the memory 12 and controls the tuner 2 (or 3) so as to receive the last channel stored therein. There is. When the last channel is not stored in the memory 12, the microcomputer 11 receives the predetermined channel set in advance,
The tuner 2 (or 3) is controlled.

The sensor 13 is a remote commander (hereinafter,
As appropriate, an infrared (IR) signal from a remote controller 14 is received, photoelectrically converted, and supplied to the microcomputer 11. The microcomputer 11 uses this sensor 1
Even in response to the signal from 1, the blocks constituting the device are controlled. The remote controller 14 is provided with various operation buttons (for example, a button for powering on / off, a button for selecting a channel, a button for adjusting a volume, etc.), and when any of the operation buttons is operated, An IR signal corresponding to the operation button is output. As described above, since this IR signal is input to the microcomputer 11 via the sensor 13, the microcomputer 11 can be caused to perform a predetermined process by operating the remote controller 14. Although not shown, the television receiver is also provided with an operation panel for performing the same processing as when the remote controller 14 is operated.

Next, referring to the flowchart of FIG.
The operation will be described. First of all, step S1
In, a variable C for measuring a predetermined time is set to 0 as an initial value. The storage area of the variable C is secured in the memory 12 in advance, and the microcomputer 11 is configured to increment the variable C at the timing of the system clock supplied from the clock circuit (not shown). ing.

Then, in step S2, the antenna 1
The television broadcast signal received at is detected and demodulated by the tuner 2 or 3, and the resulting image is displayed on the monitor 10. That is, immediately after the power is turned on, the last channel stored in the memory 12 is read by the microcomputer 11, and the control signal (PLL signal) is output to the tuner 2 so as to receive the channel. . In this case, the tuner 2 detects and demodulates a signal corresponding to the last channel in the television signal from the antenna 11 into a demodulated signal according to an instruction from the microcomputer 11, and outputs the demodulated signal to the processing circuit 4. Processing circuit 4
Then, the video signal of the demodulated signal is an RGB signal,
Output to the mixer 9. At this time, the microcomputer 11 controls the mixer 9 so that the video signal supplied from the tuner 2 via the processing circuit 4 is output as it is. Therefore, the mixer 9 causes the tuner 2 to process the processing circuit 4. The video signal supplied via the monitor is directly output to the monitor 10 and displayed. Therefore, in this case, the program (video) of the last channel is displayed on the monitor 10.

Thereafter, the process proceeds to step S3, where the variable C is N
The microcomputer 11 determines whether or not the above is the case. Here, N is a positive integer. If it is determined in step S3 that the variable C is not equal to or more than N, that is, if a predetermined time has not elapsed since the initial value 0 was set in the variable C in step S1 or step S10 described later, step S8 Then, in the microcomputer 11, for example, changing the channel or volume, the RAM 2
Necessary processing (other processing) such as 6 refresh is performed, and the process returns to step S2.

That is, when the viewer operates the remote controller 14 to select, for example, another channel, the remote controller 14 transmits (issues) an infrared signal as an operation signal corresponding to the operation. . This infrared signal is received by the sensor 13 and photoelectrically converted. And
The electric signal obtained as a result, that is, the operation signal corresponding to the operation of the remote controller 14 is supplied to the microcomputer 11. When the microcomputer 11 receives the operation signal as described above,
In step S8, the tuner 2 is controlled so as to receive the channel corresponding to the operation signal. As a result, in the same manner as described above, the program (video) of the channel selected by the viewer is displayed on the monitor 10 in step S2.

When the viewer operates the remote controller 14 so that the program of the channel currently displayed on the monitor 10 is displayed as the parent screen and the program of the other channel is displayed as the child screen, the above-described case Similarly, the operation signal corresponding to the operation is received by the microcomputer 11. Upon receiving such an operation signal, the microcomputer 11 outputs a control signal (PLL signal) to the tuner 3 so as to receive another channel in step S8. As a result, in the tuner 3, a signal corresponding to another channel in the television signal from the antenna 11 is detected and demodulated to be a demodulated signal, which is output to the processing circuit 5. In the processing circuit 5, as in the case of the processing circuit 4, the video signal of the demodulated signal is converted into an RGB signal and output to the dual screen processing block 8.

At this time, the microcomputer 11 controls the two-screen processing block 8 so that the output of the processing circuit 5 can be used as a child screen.
The video signal supplied from the processing circuit 5 is converted so as to form a child screen and output to the mixer 9. Further, at this time, the microcomputer 11 configures a picture-in-picture screen by combining the output of the processing circuit 4 as a parent screen and the output of the two-screen processing block 8 as a child screen, and synthesizing them. , And outputs a control signal to the mixer 9, whereby the mixer 9 combines the output of the processing circuit 4 and the output of the two-screen processing block 8 to form a picture-in-picture screen. The picture-in-picture screen is output and displayed on the monitor 10. As described above, step S
At 2, a picture-in-picture screen is displayed with the program of the channel received by the tuner 2 or 3 or another program of the other channel as the parent screen or the child screen, respectively.

Further, the viewer has a channel CHA or another channel CHB on the left half screen (hereinafter appropriately referred to as the left screen) or the right half screen (hereinafter appropriately referred to as the right screen) of the monitor 10. When the remote controller 14 is operated to display the program, the operation signal corresponding to the operation is received by the microcomputer 11 as in the case described above. When the microcomputer 11 receives such an operation signal, in step S8, the channel C
A control signal is output to the tuner 3 or 4 so as to receive HA or CHB, so that the tuner 3 or 4 outputs the control signal out of the television signal from the antenna 11.
A signal corresponding to the channel CHA or CHB is detected and demodulated into a demodulated signal, which is output to the mixer 9 or the two-screen processing block 8 via the processing circuit 4 or 5.

At this time, the microcomputer 11 directs the two-screen processing block 8 to output the output of the processing circuit 5 as it is.
Thus, the video signal of the channel CHB supplied from the processing circuit 5 is directly output from the dual screen processing block 8 to the mixer 9. Further, at this time, the microcomputer 11 causes the output of the processing circuit 4 or the two-screen processing block 8 to configure the left screen or the right screen of the monitor 10 (hereinafter, a screen having such a configuration is referred to as a picture and A control signal is output to a mixer (a picture (P & P) screen), and the mixer 9 synthesizes the output of the processing circuit 4 and the output of the two-screen processing block 8 to generate a picture-and-picture image. The screen is composed. The picture-and-picture screen is output to and displayed on the monitor 10. As described above, in step S2, the picture-and-picture screen in which the left screen or the right screen is formed by the program of the channel CHA or CHB received by the tuner 2 or 3 is displayed.

When the viewer operates the remote controller 14 so as to select the character multiplex broadcasting of a predetermined channel, the operation signal corresponding to the operation is received by the microcomputer 11 in the same manner as described above. To be done. Microcomputer 1
1 receives such an operation signal, the step S8
At, the control signal is output to the tuner 3 so as to receive a predetermined channel, whereby the tuner 3 detects and demodulates the signal corresponding to the predetermined channel in the television signal from the antenna 11. To be a demodulated signal. At this time, the microcomputer 11 uses the switch 6
Is controlled so that the terminal b is selected.
The demodulated signal output from the tuner 3 is supplied to the decoder 7 via the terminal b and the switch 6.

In the decoder 7 (FIG. 5), the video signal supplied through the switch 6 is input to the clock generation circuit 21 and the data slicer 22 and the clock generation circuit 2
At 1, a clock synchronized with the video signal is generated. This clock is supplied to the data slicer 22.

Based on the clock from the clock generation circuit 21, the data slicer 22 recognizes the timing of the horizontal scanning line on which the teletext data (data packet) is superimposed in the video signal input thereto. The teletext data superimposed on the horizontal scanning line is extracted. This teletext data is supplied to the buffer 23,
It is temporarily stored. After that, in the display screen configuration unit 25, the teletext data stored in the buffer 23 is read out and converted into display data. This display data is R
Once stored in the AM 26.

At this time, the microcomputer 11 controls the display screen construction unit 25 so as to output the display data,
The display screen configuration unit 25 reads display data from the RAM 26 according to a command from the microcomputer 11, performs processing necessary for display, converts the display data into RGB video signals, and outputs the RGB video signals to the dual screen processing block 8. Further, at this time, the microcomputer 11 controls the two-screen processing block 8 so as to output the output of the decoder 7 as it is, and
The mixer 9 is controlled so that the output of the two-screen processing block 8 is output as it is.
The video signal from the 2 screen processing block and the mixer 9
It is directly output to the monitor 10 via. As described above, in step S2, the screen of the teletext of the channel received by the tuner 3 is displayed.

Further, the viewer operates the remote controller 14 so as to display a television broadcast program of a certain channel CHA or a character multiplex broadcast program of another channel CHB on the left screen or the right screen of the monitor 10, respectively. In this case, the operation signal corresponding to the operation is received by the microcomputer 11 in the same manner as the above case. Microcomputer 11
When receiving such an operation signal, outputs a control signal to the tuner 3 or 4 so as to receive the channel CHA or CHB in step S8,
As a result, in the tuner 3 or 4, the signals corresponding to the channels CHA or CHB of the television signal from the antenna 11 are detected and demodulated to be demodulated signals.

At this time, the microcomputer 11 controls the switch 6 to select the terminal b, so that the demodulated signal output from the tuner 3 is supplied to the decoder 7 via the terminal b and the switch 6. The demodulated signal output from the tuner 2 is supplied to the mixer 9 via the processing circuit 4.

On the other hand, in the decoder 7, as described above, the screen of the character multiplex broadcasting of the channel CHB is constructed and output to the mixer 9. At this time, the microcomputer 11
Indicates that the output of the processing circuit 4 or the decoder 7 is the monitor 10
The control signal is output to the mixer 9 so as to configure the left screen or the right screen of the above, whereby the mixer 9 synthesizes the output of the processing circuit 4 and the output of the decoder 7, and outputs the picture and picture. The screen is composed. The picture-and-picture screen is output to and displayed on the monitor 10. As described above, in step S2, the channel CH received by the tuner 2 or 3 is received.
A picture-and-picture screen having a left screen or a right screen is displayed in the television broadcast program A or the character multiplex broadcast program in CHB.

It should be noted that depending on the viewer, for example, the monitor 10
When the remote controller 14 is operated so as to display a television broadcast program or a character multiplex broadcast program on the same channel on the left screen or the right screen, respectively, the microcomputer 11 switches the switch 6 and the terminal a to Control to choose. In this case, the output of the tuner 2 is supplied to the decoder 7, and thereafter, in the same manner as described above, a picture-and-picture screen composed of a television broadcast program and a character multiplex broadcast program on the same channel is displayed. It is displayed on the monitor 10.

Further, when it is not necessary to operate the tuner 3 and the viewer has reserved the viewing of the character multiplex broadcasting of a predetermined channel, the microcomputer 11
The tuner 3 is controlled so as to receive the predetermined channel, and the switch 6 is controlled so as to select the terminal b. Furthermore, in this case,
The microcomputer 11 controls the display screen configuration unit 25 so that the RAM 26 of the decoder 7 always stores the latest display data, that is, the RAM 26 is refreshed. Therefore, in this case, the RAM 26
Since the display data of the latest character multiplex broadcast received by the tuner 3 is always stored in, the display data of, for example, when the television broadcast is switched to the character multiplex broadcast,
By reading the display data from the RAM 26,
The latest teletext broadcasting can be displayed.

On the other hand, in step S3, the variable C is N
If it is determined that the above is the case, that is, if a predetermined time has elapsed since the initial value 0 was set in the variable C in step S1 or S10, the process proceeds to step S4.
When the switch 6 selects the terminal b (for example, as described above, when the switch 6 is switched to the terminal b side for refreshing the RAM 26), the switch 6 is switched by the microcomputer 11. It is forcibly switched to the terminal a side. If the switch 6 has already selected the terminal a, the process of step S4 is skipped.

Then, in step S5, the tuner 2
The microcomputer 11 determines whether or not the teletext data superimposed on the television broadcast signal of the channel received (detected or demodulated) by the subtitle is, for example, caption representing the dialogue or content of the program of the channel. To be done.

That is, when the switch 6 is switched to the terminal a side, the demodulated signal output from the tuner 2 is supplied not only to the processing circuit 4 but also to the decoder 7 via the terminal a and the switch 6. In the decoder 7, as described above, the teletext data superimposed on the demodulated signal (video signal) output from the tuner 2 is stored in the buffer 23.
Memorized in. Then, in the detection circuit 24, whether or not the teletext data stored in the buffer 23 is a caption is detected by referring to the data identification code as described above. Based on the output of the detection circuit 24, the microcomputer 11 determines whether or not the teletext data superimposed on the television broadcast signal of the channel received by the tuner 2 is a caption.

When it is determined in step S5 that the teletext data superimposed on the television broadcast signal of the channel received by the tuner 2 is not a subtitle, the process proceeds to step S9, and the switch S6 causes the microcomputer 1 to operate.
It is switched to the terminal b side by 1. If the process of step S4 is skipped, the process of step S6 is also skipped.

Then, the process proceeds to step S10, in which the variable C is set to 0 as an initial value, whereby the counting of a predetermined time is started again. After the process of step S10, the process returns to step S2 via step S8.

On the other hand, in step S5, the tuner 2
When it is determined that the teletext data superimposed on the television broadcast signal of the channel received in step S11 is a caption, the process proceeds to step S6, and the teletext data, that is, caption is displayed. That is, in this case, the microcomputer 11 controls the display screen configuration unit 25 of the decoder 7 so as to output the caption, and combines the caption output from the decoder 7 with the video signal output from the processing circuit 4 ( In this case, the mixer 9 is controlled to superimpose). As a result, the image of the television broadcast in which the subtitles are superimposed is output from the mixer 9 and displayed on the monitor 10.

Therefore, for example, as shown in FIG.
Even if only the TV broadcasting program of a certain channel is displayed, when the character multiplex broadcasting of subtitles is started on that channel, the character multiplex broadcasting started on that channel is added to the video of the TV broadcasting program of that channel. Broadcast subtitles are superimposed and displayed. In addition, as shown in FIG. 7B, for example, even if a television broadcast program of a certain channel CHA and a character multiplex broadcast program of another channel CHB are displayed on the picture-and-picture screen, When the character multiplex broadcasting of the subtitles is started on the CHA, the subtitles of the character multiplex broadcasting started on the channel CHA are superimposed and displayed on the video of the program on the channel CHA.

Thereafter, the process proceeds to step S7, where the variable C is set to N.
Is set, and the process returns to step S2 via step S8. Here, while the teletext data is a caption, the variable C is set to N as described above in step S7, so that after the determination processing in step S3, the variable C is always set in step S7.
You will proceed to 4.

As described above, whether or not the teletext data superimposed on the television broadcast signal of the channel received by the tuner 2 is a caption is detected regularly (every predetermined time). If the teletext data is subtitles, the subtitles are superimposed and displayed on the video of the television broadcast program. Therefore, a decoder for decoding the teletext data is used.
If the subtitles are being broadcast on the channel that is currently being viewed, the subtitles can be preferentially displayed without providing one, that is, without increasing the size and cost of the device.

Therefore, for example, a viewer who has a hearing impairment and wants to preferentially display the subtitle when the subtitle broadcasting by the character multiplex broadcasting is started,
In order to confirm whether or not the subtitles are being broadcast, it is possible to avoid the troublesome operation of the remote controller 14.

While the present invention has been described as applied to a television receiver for receiving a television broadcast signal transmitted by terrestrial waves, the present invention is not limited to satellite lines and CATV networks. It can also be applied to an apparatus for receiving a television broadcast signal transmitted via.

When the RAM 26 is not refreshed, the tuner 3 is made to receive the same channel as the channel being received by the tuner 2 and its output is sent to the decoder 7 via the switch 6. By inputting, it is possible to detect whether the teletext data superimposed on the television broadcast signal of the channel received by the tuner 2 is a subtitle.

Further, in the present embodiment, when the switch 6 selects the terminal b side, the variable C is set to N
The switch 6 is switched to the terminal a side every time when the switch 6 is switched to the terminal a side.
It is also possible to do it irregularly.

Further, in the present embodiment, when the teletext data is a subtitle, the subtitle is forcibly displayed. However, such a compulsory display is not performed, but
It is also possible to notify the viewer to that effect through the monitor 10 or a speaker (not shown). Also, some viewers prefer not to display the subtitles even if the subtitles broadcast by the character multiplex broadcasting is started, so the viewer can set whether to display the subtitles forcibly or not. It is desirable to do so.

Furthermore, the monitor 10 and the other blocks can be configured as separate devices.

The television broadcasting system is NTSC.
The present invention is not limited to the one based on the system, and the transmission system of the character multiplex broadcast is not particularly limited.

In this embodiment, basically, the tuner 2 or 3 is made to receive the television broadcast or the character multiplex broadcast respectively, but the tuner 2 or 3 is basically made to receive the broadcast. , And vice versa.

Further, in the present embodiment, the case where the character broadcast data is superimposed in the vertical blanking period of the video signal of the television broadcast has been described, but the present invention is not limited to this. For example, the horizontal blanking of the video signal is performed. It is also applicable to the case where teletext data is superimposed on a period or the like.

[0073]

As described above, according to the receiving apparatus and the receiving method of the present invention, when the selecting means selects the demodulated signal output from the second receiving means,
The demodulated signal output from the receiving means is periodically selected, and when the selecting means selects the demodulated signal output from the first receiving means, the teletext data extracted by the decoding means is captioned. Whether or not there is detected. Then, when it is detected that the teletext data is subtitles, the selection unit is forced to select the demodulated signal output from the first reception unit. Therefore, it is possible to preferentially display subtitles without increasing the size and cost of the device.

[Brief description of drawings]

FIG. 1 is a waveform diagram showing a vertical blanking period of a television broadcast signal.

FIG. 2 is a diagram showing basic parameters of character multiplex broadcasting.

FIG. 3 is a diagram showing a format of a data packet.

FIG. 4 is a block diagram showing a configuration of an embodiment of a television receiver to which the present invention has been applied.

5 is a block diagram showing a detailed configuration example of a decoder 7 in FIG.

FIG. 6 is a flowchart for explaining the operation of the embodiment of FIG.

FIG. 7 is a diagram for explaining that subtitles are preferentially displayed.

[Explanation of symbols]

2,3 U / V tuner 4.5 Y / C / J processing circuit 6 switch 7-character multiplex broadcast decoder 8 2 screen processing block 9 mixer 10 monitors 11 Microcomputer 12 memories 13 sensors 14 Remote Commander 21 Clock generation circuit 22 Data slicer 23 buffers 24 Detection circuit 25 Display screen configuration section 26 RAM

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/445 H04N ^7/ 025-7/035

Claims (4)

(57) [Claims] 1. A receiving apparatus for receiving a television broadcast signal on which teletext data, which is data for teletext broadcasting, is superimposed, the receiving device receiving the television broadcast signal and demodulating a signal of a predetermined channel. And a second receiving means for outputting a demodulated signal by means of one, and a single decoding means for extracting and decoding the teletext data from either of the demodulated signal outputted by the first or second receiving means. And output means for outputting any one of the outputs of the first and second receiving means or the decoding means, or for combining and outputting any two of them. Selecting means for selecting one of the signals output from the first or second receiving means and supplying it to the decoding means; and the restoring means for outputting the selecting means from the second receiving means. When selecting a signal, the selecting unit controls the selecting unit to periodically select the demodulated signal output from the first receiving unit, and the selecting unit includes the first receiving unit. Detecting means for detecting whether or not the teletext data extracted by the decoding means is subtitles when the demodulated signal output from the means is selected, the control means includes the detecting means. The receiving device forcibly selecting the demodulated signal output from the first receiving unit by the selecting unit when it is detected that the teletext data is a subtitle. 2. The receiving device according to claim 1, further comprising display means for displaying an output of the output means. 3. The output means, when the detection means detects that the teletext data is subtitles,
The receiving apparatus according to claim 1, wherein outputs of the first receiving unit and the decoding unit are combined and output. 4. A first and second receiving means for receiving a television broadcast signal on which teletext data, which is data for teletext broadcasting, is superimposed, demodulating a signal of a predetermined channel and outputting a demodulated signal. And one decoding means for extracting and decoding the teletext data from any of the demodulated signals output from the first or second receiving means, the first and second receiving means, or Output means for outputting any one of the outputs of the decoding means, or combining and outputting any two of them, and a signal output from the first or second receiving means. A receiving method of a receiving device, comprising: selecting means for selecting either one and supplying to the decoding means, wherein the selecting means selects the demodulated signal output from the second receiving means. In this case, the selecting means is caused to periodically select the demodulated signal output from the first receiving means, and the selecting means selects the demodulated signal output from the first receiving means. When it is detected that the teletext data extracted by the decoding means is a subtitle, and when the teletext data is detected as a subtitle, the selection means is caused to perform the first reception. A receiving method characterized in that the demodulated signal output from the means is forcibly selected.